in fact, over the last five years, no other energy company has invested more in the us than bp. we're working to fuel america for generations to come. today, our commitment to the gulf, and to america, has never been stronger. the single mother once on >>> we all know jk rowling is the single mother once on welfare who knew every child wants to be a wizard. a harry potter. after selling 450 million copy, rowling is trying to reach into the mind of adults. and abc's cynthia mcfadden has an exclusive first look. >> reporter: book, movies, merchandise a theme park. "harry potter" universe, j.k. rowling's creation, has spellbound millions. but now rowling is leaving the wizarding world behind for a decidedly adult novel called "the casual vacancy." but she hasn't abandoned her guiding values. you said about "harry potter," that at the end, love won out. what wins out here in "vacancy"? >> the absence of love certainly causes some very profound problems in the book. the two things that obsess me are morality and mortality. and clearly that was "harry potter." and in a very, very diff